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gqlalchemy.disk_storage

OnDiskPropertyDatabase Objects​

class OnDiskPropertyDatabase(ABC)

An abstract class for implementing on-disk storage features with specific databases.

save_node_property​

def save_node_property(node_id: int, property_name: str,
                       property_value: str) -> None

Saves a node property to an on disk database.

load_node_property​

def load_node_property(node_id: int, property_name: str,
                       property_value: str) -> Optional[str]

Loads a node property from an on disk database.

delete_node_property​

def delete_node_property(node_id: int, property_name: str,
                         property_value: str) -> None

Deletes a node property from an on disk database.

save_relationship_property​

def save_relationship_property(relationship_id: int, property_name: str,
                               property_value: str) -> None

Saves a relationship property to an on disk database.

load_relationship_property​

def load_relationship_property(relationship_id: int, property_name: str,
                               property_value: str) -> Optional[str]

Loads a relationship property from an on disk database.

delete_relationship_property​

def delete_relationship_property(node_id: int, property_name: str,
                                 property_value: str) -> None

Deletes a node property from an on disk database.

drop_database​

def drop_database() -> None

Deletes all entries from the on disk database.

SQLitePropertyDatabase Objects​

class SQLitePropertyDatabase(OnDiskPropertyDatabase)

execute_query​

def execute_query(query: str) -> List[str]

Executes an SQL query on the on disk property database.

Arguments:

  • query - A string representing an SQL query.

Returns:

A list of strings representing the results of the query.

drop_database​

def drop_database() -> None

Deletes all properties in the database.

save_node_property​

def save_node_property(node_id: int, property_name: str,
                       property_value: str) -> None

Saves a node property to an on disk database.

Arguments:

  • node_id - An integer representing the internal id of the node.
  • property_name - A string representing the name of the property.
  • property_value - A string representing the value of the property.

load_node_property​

def load_node_property(node_id: int, property_name: str) -> Optional[str]

Loads a node property from an on disk database.

Arguments:

  • node_id - An integer representing the internal id of the node.
  • property_name - A string representing the name of the property.

Returns:

An optional string representing the property value.

delete_node_property​

def delete_node_property(node_id: int, property_name: str) -> None

Deletes a node property from an on disk database.

Arguments:

  • node_id - An integer representing the internal id of the node.
  • property_name - A string representing the name of the property.

save_relationship_property​

def save_relationship_property(relationship_id: int, property_name: str,
                               property_value: str) -> None

Saves a relationship property to an on disk database.

Arguments:

  • relationship_id - An integer representing the internal id of the relationship.
  • property_name - A string representing the name of the property.
  • property_value - A string representing the value of the property.

load_relationship_property​

def load_relationship_property(relationship_id: int,
                               property_name: str) -> Optional[str]

Loads a relationship property from an on disk database.

Arguments:

  • relationship_id - An integer representing the internal id of the relationship.
  • property_name - A string representing the name of the property.

Returns:

An optional string representing the property value.

delete_relationship_property​

def delete_relationship_property(relationship_id: int,
                                 property_name: str) -> None

Deletes a node property from an on disk database.

Arguments:

  • relationship_id - An integer representing the internal id of the relationship.
  • property_name - A string representing the name of the property.